is it possible to build a game , that ll look like AGE OF EMPIRES with characters and map , in SFML ? i m starting from scratch , map is ready . i want certain characters in the game to be bots . am i on the right way ? or should i hack an existing SFML game , and rebuild the game logic ? if anything is there let me know ?

Yes this is completely possible using SFML, I am doing this exact same thing, building a 2D tile-based strategy game using SFML. So far I've found it to be a really good library to use for this purpose. Good luck in your efforts!